Fan



FIG. 1 is a perspective front view,

FIG. 2 is a rear view,

FIG. 3 is a front view,

FIG. 4 is a left side view, with respect to FIG. 3,

FIG. 5 is a right side view, with respect to FIG. 3,

FIG. 6 is a bottom plan view, with respect to FIG. 3,

FIG. 7 is a top plan view, with respect to FIG. 3; and,

FIG. 8 is a perspective rear view.

Any broken lines in the figures illustrate portions of the fan that form no part of the claimed design. 

CLAIM The ornamental design for a fan, as shown and described. 